Valve for hydraulic brake systems



Feb. 18; 1941. I M. KATCHER 2,232,113

VALVE FOR HYDRAULIC BRAKE SYSTEMS Filed Dec. 26, 1939 INV TO R Morris er ATTORNEY Patented Feb. 18, 1941 w p 2,232,113

UNITED STATES PATENT QFFWE VALVE FOR. HYDRAULIC BRAKE SYSTEMS Morris Katcher, New York, N. Y.

Application December 26, 1939, Serial No. 310,937

6 Claims. (01. 277- 35) This invention relates to improvements in and forward of flange 25 are five centering angles valves used in the master cylinder of hydraulic or lugs 26 for maintaining frame 23 axially slid brake systems wherein said valve is actuated by able in its central position in cylinder 8. movement of a piston mounted within the cyl- Mounted on the rear face of flange 25 is an an- 5 inder to regulate the pressure within fluid preslllar gasket 28 of rubber or like resilient masure lines and interconnected wheel --cylinders. terial held in position thereon by a sheet metal In order to prevent air from entering the syscage 29. Cage 29 has a web 3! and plurality of tem at the Wheel brake cylinders, it is desirable forwardly extending prongs 359 which pass to maintain a higher than atmospheric pressure through gasket 28 at the junction of its outer in the wheel brake cylinders and the fluid conthick portion with its inner thin portion. 10 duits leading thereto from the master cylinder. Prongs 36 pass through slits provided in flange For this purpose a double acting valve is pro- 25 and have their forward ends bent over to vided at the discharge end of the master cylinder, form tongues 32, causin he inner thin portion allowing the fluid to leave the cylinder freely of gasket 28 to be squeezed between Web 3! and but restraining its return to the cylinder to flange 25. Extending radially inward and. form maintain a predetermined pressure in the wheel ward of web Bl are three curved lugs 33. In brake cylinders and fluid conduits. Fig. 5, cage 29 is shown by itself, four of the Other objects and advantages will become approngs 30 being shown before their ends are parent upon further study of the description bent over to form tongues 32, two of them being and drawing, in which so bent. When cage 29 is in position on gasket 20* Fig. 1 is a longitudinal section through the 28 and flange 25, all six of the prongs (il have reservoir and operating cylinder of the pressure tongues 32 bent over from them. Mounted inproducing mechanism. side of cylindrical wall 24 and held against frame Fig. 2 is a cross section taken along the line 23 at the rear of the opening 34 is a hexagonal 2-2 of Fig. 1. plate 35 of hard rubber, fiber or the like. Spring 25.

Fig. 3 is a partial longitudinal section taken 36, extending between plate 35 and web 53!, holds along the line 3--3 of Fig. 2. plate 35 against frame 23 at opening 36. Lugs Fig. 4 is a cross section taken along the line 33 center Spr g 36 on web 3|. A spring H ex- 44 of Fig. 3. tends between cup washer M on piston is and Fig. 5 is a perspective View of the cage for supflange 25 of valve frame 23, holding gasket 28 30 porting the gasket of the valve, said cage having tight against cylinder head 2!.

some of the prongs unbent as before assembly, When pedal I3 is depressed, rod is is pushed to d the rear, forcing piston l5 inward or to the rear Fig. 6 is a perspective View of the valve plate. i cy d r 3 aga Spring i AS l Washer Reservoir 'l for holding brake fluid is formed M is pushed inward ag the liquid in y i de 35 on the outside of cylinder 8. A flexible boot 9 8 its sides open up preventing passage of liquid is attached to the left end of cylinder 8. Passing to the rear of it and through ports H. The inthrough boot 9 is a piston rod m, Nuts H and Ward motion of piston l5 draws liquid into space l2, threaded on rod ID, tightly grip boot 9 where l8 through port 38 between cylinder 8 and reser- 40 rod I0 passes through to prevent leakage. The voir l and cuts of!" p t preventing he flow o outer end of rod I0 is operated by brake pedal of liquid from the cylinder into the reservoir. 13, the inner end of the rod engaging piston is. The liquid in the cylinder to the rear of washer The forward end of piston I 5 is provided with 4 is f rc thro gh o n ng 3 i fr 23 p a gasket l6 while its rear has a collar I9 formed p a e forcing the latter back a nst e thereon which carries a rubber cup washer Hi. p es ure of Sp th Cylinder head ii 45 Ports I! are provided in collar [9, extending into pressure tubes 22 and from thence into the from in front of washer M to the annular space brake system. It is to be noted that the po y l8 around the piston. The forward motion of onal shape of pl 35 D V S p between piston I5 is limited by wire ring 29 set in a its flat sides and the inside of cylindrical wall groove formed in cylinder 8. Cylinder head 2! 24, while the corners serve as guides. When so which carries the pressure transmitting tubes pedal I3 is released spring 3! pushes forward 22 is screwed on the body of the cylinder. piston [5 until stopped by wire ring When Sheet metal valve frame 23 has a cylindrical this occurs, the liquid returning from the brake or annular side wall 24 and a rear radially exsystem through tubes 22, lifts the valve formed tending flange 25. Extending radially outward by frame 23, plate 35 and gasket 28 from its seat 55 on cylinder head 2| and flows past said Valve in to cylinder 8. Due to its forward motion, the

sides of washer [4 are pushed radially inward as liquid flows past it from space l8 and ports l1. Liquid is also brought into the piston through port 39 from reservoir 1 when the pressure in the piston becomes low enough. Liquid continues to pass into cylinder 8 past gasket 28 from tubes 22 until the pressure in said tubes and the brake system has dropped to about 10 lbs., when frame 23 and the gasket 28 are forced back by spring 31 against cylinder head 2! stopping further reduction in pressure. Spring 31 is made with the proper strength to effect this.

I claim:

,1. A valve mechanism for the master cylinder of a hydraulic brake system comprising a frame slidably mounted in the cylinder and having an opening for the passage of fluid therethrough, a member for tightly closing said opening against fluid entering the cylinder, spring means yieldingly seating said member on the frame against pressure of fluid leaving the cylinder, said frame having a radially extending portion, an annular gasket of flexible resilient material set on the rear face of said portion, a cage set on the rear of the gasket having prongs extending forward passing through the gasket and said portion, said prongs being deformed at their forward ends for clamping the gasket to said portion, and spring means extending forward in the cylinder engaging the frame for yieldingly maintaining the gasketagainst a seat in the rear cylinder end, the rear cylinder end having a port yieldingly closed by said frame with the gasket and said member.

2. A valve mechanism for the master cylinder of a hydraulic brake system comprising a frame slidably mounted in the cylinder and having an opening for the passage of fluid therethrough, a member for closing said opening against fluid entering the cylinder, spring means yieldingly seating said member onthe frame against pressure of fluid leaving the cylinder, said frame having a radially extendin portion, an annular gasket of flexible, resilient material set on the rear face of said portion, a cage set on the rear of the gasket having prongs extending forward passing through the gasket and said portion, said prongs being deformed at their forward ends for clamping the gasket to said portion, said gasket having an outer annular part thicker than its inner part, said outer part extending to the rear of said inner part, the cage being set on the gasket at its thinner part, and spring means extending forward in the cylinder engaging the frame for yieldingly maintaining the thicker part of the gasket against a seat in the rear cylinder end, the rear cylinder end having a port yieldingly. closed by said frame with the asket and said member.

3. A valve mechanism as claimed in claim 1 in which the cage has a radially extending web with an opening therein in communication with the opening in the frame, the web being set on the gasket and the prongs extending forward from the web.

4. A valve mechanism for the master cylinder of a hydraulic brake system comprising a frame slidably mounted in the cylinder and having an Opening for the passage of fluid therethrough, a member for tightly closing said opening against fluid entering the cylinder, said frame having an annular radially extending portion, an annular flexible resilient gasket set on the rear face of said portion, .a cage with an annular web portion set on the rear face of the gasket, prongs extending forward from the web of the cage, said prongs passing through the gasket and said portion, the forward ends of the prongs being deformed for preventing their removal from said portion, the web portion of the cage having a portion extending radially inward from the gasket, and spring means reacting against said member and said latter portion for yieldingly seating said member on the frame at said open ing against pressure of fluid leaving the cylinder.

5. A valve mechanism for the master cylinder of a hydraulic brake system comprising a frame having a radially extending front face with an pening therein, an annular wall extending to the rear axially along the cylinder from said face, radially disposed means extending outward from said wall for slidably mounting the frame in the cylinder, said radially disposed means allowing space for the passage of fluid by it, an annular gasket set on said radially disposed means and extending to the rear thereof, a cage attached to said frame, said cage having a part at the rear of the gasket fastening the latter to said radially disposed means, a portion of said cage extending inside of said annular wall, said radially disposed means providing a seat for spring means, said spring means extending forward in the cylinder and yieldably maintaining the gasket against a seat in the rear cylinder end, a member inside said annular wall seating on the rear of said face at its opening, and spring means inside the annular wall reacting at one end against the portion of the cage inside said annular wall and at the other end against said member for yieldingly seating it on said face and closing off said opening, the rear cylinder end having a port closed by said frame with its gasket and the member seated on the rear of said face.

6. A valve mechanism for the master cylinder of a hydraulic brake system comprising a frame having a radially extending front face with an opening therein, an annular wall extending to the rear axially along the cylinder from said face, radially disposed means extending outward substantially at the rear of said wall for slidably mounting the frame in the cylinder, said radially disposed means allowing space for the passage of fluid by it, an annular gasket set on said radially disposed means and extending to the rear thereof, a cage attached to said frame, said cage having a web at the rear of the gasket holding the latter against said radially disposed means, lugs inside said axial wall extending radially inward and axially forward from said web, said radially disposed means providing a seat for spring means, said spring means extending forward in the cylinder and yieldably maintaining the gasket against a seat in the rear. cylinder end, a member inside said annular wall seating-on the rear of said face at its opening, and spring means inside the annular wall reacting at its rear end against the cage and at its forward end against said member for yieldingly seating it on said face and closing off said opening, said lugs maintaining the latter spring means in its radial position, the rear cylinder end having a port closed by said frame with its gasket and the member seated on the rear of said face.

MORRIS KATCHER, 

